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Fair value (Estimated fair value and carrying value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 1,455,685 $ 1,588,425    
Federal Home Loan Bank (FHLB) stock 24,430 24,450    
Derivative Assets 15,861 20,502    
Servicing Assets 13,970 13,801    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative liabilities 13,830 14,937    
Assets,Carrying Value [Abstract]        
Total cash and cash equivalents 624,636 621,269 566,996 868,695
Restricted Cash And Cash Equivalents 15,170 82,199    
Securities Purchased under Agreements to Resell 0 60,000    
Trading Securities 1,910 1,869    
Total loans not covered under shared-loss agreements with FDIC, net 4,635,394 4,615,929    
Covered, net 347,865 356,961    
FDIC Indemnification Asset 166,194 189,240 283,124 302,295
Accrued interest receivable 18,969 18,734    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 5,300,992 5,383,265    
Securities Sold under Agreements to Repurchase 1,012,240 1,267,618    
Federal Funds Purchased 23,712 0    
Subordinated capital notes 100,404 100,010    
Accrued expenses and other liabilities 140,037 144,424    
Fair Value, Inputs, Level 1 [Member]
        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 624,636 621,269    
Restricted Cash, at Fair Value 15,170 82,199    
Assets,Carrying Value [Abstract]        
Total cash and cash equivalents 624,636 621,269    
Restricted Cash And Cash Equivalents 15,170 82,199    
Fair Value, Inputs, Level 2 [Member]
        
Assets, Fair Value Disclosure [Abstract]        
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure 0 60,000    
Available-for-sale Securities 1,435,632 1,568,745    
Federal Home Loan Bank (FHLB) stock 24,430 24,450    
Derivative Assets 3,306 4,072    
Receivables, Fair Value Disclosure 13,830 14,937    
Liabilities, Fair Value Disclosure [Abstract]        
Short term borrowings 0 0    
Assets,Carrying Value [Abstract]        
Securities Purchased under Agreements to Resell 0 60,000    
Trading Securities 1,910 1,869    
Investment securities AFS , carrying value 1,435,632 1,568,745    
Federal Home Loan Bank Stock at carrying value 24,430 24,450    
Derivative Assets, carrying value 3,306 4,072    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities at carrying value 13,830 14,937    
Other Short Term Borrowings 0 0    
Fair Value, Inputs, Level 3 [Member]
        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 20,053 19,680    
Non-covered loans, net 4,737,604 4,857,505    
Covered loans, net 400,355 459,444    
Derivative Assets 12,555 16,430    
FDIC Indemnification Asset Fair Value Disclosure 106,170 152,965    
Receivables, Fair Value Disclosure 18,969 18,734    
Servicing Assets 13,970 13,801    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 5,247,226 5,409,540    
Securities sold under agreements to repurchase 1,076,000 1,323,903    
Advances from FHLB 340,805 335,324    
Federal Funds Purchased, Fair Value Disclosure 23,712 0    
Notes Payable Fair Value Disclosure 3,583 3,638    
Subordinated capital notes 87,240 99,316    
Accrued expenses and other liabilities 140,037 144,424    
Assets,Carrying Value [Abstract]        
Investment securities AFS , carrying value 20,053 19,680    
Total loans not covered under shared-loss agreements with FDIC, net 4,654,749 4,662,458    
Covered, net 347,865 356,961    
Derivative Assets, carrying value 12,555 16,430    
FDIC Indemnification Asset 166,194 189,240    
Accrued interest receivable 18,969 18,734    
Servicing assets, carrying value 13,970 13,801    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 5,300,992 5,383,265    
Securities Sold under Agreements to Repurchase 1,012,240 1,267,618    
Advances from FHLB 335,689 336,143    
Federal Funds Purchased 23,712 0    
Term Notes 3,708 3,663    
Subordinated capital notes 100,404 100,010    
Accrued expenses and other liabilities $ 140,037 $ 144,424